ISP1507CBS STEricsson, ISP1507CBS Datasheet - Page 15

• Manufacturer Part Number: ISP1507CBS
• Manufacturer: STEricsson

Specifications of ISP1507CBS

• Lead Free Status / RoHS Status: Supplier Unconfirmed

NXP Semiconductors
Table 4.
ISP1507C_ISP1507D_1
Product data sheet
Signal
LINESTATE0 DATA0
LINESTATE1 DATA1
Signal mapping during low-power mode
Maps to
8.1.2 Low-power mode
Table 3.
When the USB is idle, the link can place the ISP1507 into low-power mode (also called
suspend mode). In low-power mode, the data bus definition changes to that shown in
Table
register (see
signal. The ISP1507 will draw only suspend current from the V
During low-power mode, the clock on XTAL1 may be stopped. The clock must be started
again before asserting STP to exit low-power mode. After exiting low-power mode, the
ISP1507 will send an RXCMD to the link if a change was detected in any interrupt source,
and the change still exists. An RXCMD may not be sent if the interrupt condition is
removed before exiting.
For more information on low-power mode enter and exit protocols, refer to UTMI+ Low Pin
Interface (ULPI) Specification Rev. 1.1 .
Signal
name
DIR
STP
NXT
Direction
O
O
4. To enter low-power mode, the link sets the SUSPENDM bit in the FUNC_CTRL
ULPI signal description
Direction on
ISP1507
O
I
O
Section
Description
combinatorial LINESTATE0 directly driven by the analog receiver
combinatorial LINESTATE1 directly driven by the analog receiver
10.1.2) to logic 0. To exit low-power mode, the link asserts the STP
Rev. 01 — 28 May 2008
Signal description
Direction: Controls the direction of data bus DATA[7:0]. In synchronous
mode, the ISP1507 drives DIR to LOW by default, making the data bus
an input so that the ISP1507 can listen for TXCMDs from the link. The
ISP1507 drives DIR to HIGH only when it has data for the link. When
DIR and NXT are HIGH, the byte on the data bus contains decoded
USB data. When DIR is HIGH and NXT is LOW, the byte contains
status information called RXCMD (receive command). The only
exception to this rule is when the PHY returns register read data, where
NXT is also LOW, replacing the usual RXCMD byte. Every change in
DIR causes a turnaround cycle on the data bus, during which DATA[7:0]
is not valid and must be ignored by the link.
DIR is always asserted during low-power and serial modes.
Stop: In synchronous mode, the link drives STP to HIGH for one cycle
after the last byte of data is sent to the ISP1507. The link can optionally
assert STP to force DIR to be deasserted.
In low-power and serial modes, the link holds STP at HIGH to wake up
the ISP1507, causing the ULPI bus to return to synchronous mode.
Next: In synchronous mode, the ISP1507 drives NXT to HIGH to
throttle data. If DIR is LOW, the ISP1507 asserts NXT to notify the link
to place the next data byte on DATA[7:0] in the following clock cycle. If
DIR is HIGH, the ISP1507 asserts NXT to notify the link that a valid
USB data byte is on DATA[7:0] in the current cycle. The ISP1507 always
drives an RXCMD when DIR is HIGH and NXT is LOW, unless register
read data is to be returned to the link in the current cycle.
NXT is not used in low-power or serial mode.
…continued
ULPI HS USB host and peripheral transceiver
ISP1507C; ISP1507D
CC
supply (see
© NXP B.V. 2008. All rights reserved.
Table
14 of 74
44).